Data from "Prairie Type (2-6-2) Locomotives Built for the Peking-Hankow Railway China," The Weekly Review of the Far East, Vol XX, No 8 (22 April 1922), pp. 306, 308. See also DeGolyer, Volume 60, pp. 229+. Works numbers were 54718-54740 in April 1921 and 54753-54761, 54778-54782, 54788-54801 in May 1921.
In addition to the basic equipment, the China Weekly Review's report notes the extras: "Westinghouse airbrakes, Nathan simplex No. 8 type K. injectors, Nathan five feed Bull's Eye lubricators, Coale safety valves, 18" round case headlights fitted with Pyle National type K-2 ' incandescent electric equipment and Janney M. C. B. automatic couplers." Ten-inch (254 mm) piston valves served the cylinders. Firebox heating surface area included 56 sq ft (5.2 sq m) in the combustion chamber and 15 sq ft (1.4 sq m) of arch tubes.
These were the latest Prairies to be built for this railway. Compared to North American 2-6-2s, the design was small and low-drivered.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 511 |
| Locobase ID | 10975 |
| Railroad | Peking Hankow |
| Country | USA |
| Whyte | 2-6-2 |
| Number in Class | 30 |
| Road Numbers | 511-540 |
| Gauge | Std |
| Number Built | 30 |
| Builder | Baldwin |
| Year | 1921 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.83 / 4.22 |
| Engine Wheelbase (ft / m) | 31.58 / 9.63 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 53.85 / 16.41 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 33,060 / 14,996 |
| Weight on Drivers (lbs / kg) | 99,000 / 44,906 |
| Engine Weight (lbs / kg) | 155,000 / 70,307 |
| Tender Loaded Weight (lbs / kg) | 92,500 / 41,957 |
| Total Engine and Tender Weight (lbs / kg) | 247,500 / 112,264 |
| Tender Water Capacity (gals / ML) | 4800 / 18.18 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 7 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 55 / 27.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 59 / 1499 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 25,471 / 11553.46 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.89 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 130 - 2" / 51 |
| Flues (number - dia) (in / mm) | 21 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 14.62 / 4.46 |
| Firebox Area (sq ft / m2) | 183 / 17 |
| Grate Area (sq ft / m2) | 31.50 / 2.93 |
| Evaporative Heating Surface (sq ft / m2) | 1618 / 150.32 |
| Superheating Surface (sq ft / m2) | 371 / 34.47 |
| Combined Heating Surface (sq ft / m2) | 1989 / 184.79 |
| Evaporative Heating Surface/Cylinder Volume | 171.22 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5355 |
| Same as above plus superheater percentage | 6372 |
| Same as above but substitute firebox area for grate area | 37,021 |
| Power L1 | 10,387 |
| Power MT | 693.92 |